AIDS-104591 AIDS104591 Cephalosporin fluoroquinolonate deriv S-PCT [3-[(Acetyloxy)methyl]-2-carboxy-8-oxo-5-thia-1-azabicyclo[4,2,0]oct-2-en-7-yl]ammonium, 1-cyclopropyl-7-piperazin-1-yl)-1,4-dihydro-4-oxo-3-quinoline carboxylate